Machine for grinding the edges of watch glasses



July 18, 1933. P. REUSSER 1,913,668

MACHINE FOR GRINDING THE EDGES 0F WATCH GLASSES Filed Feb. 28, 1929 4 Sheets-Sheet 1 Jjzvezzi'ar:

July 18, 1933. P. REUSSER 1,918,668

MACHINE FOR GRINDING THE EDGES 0F WATCH GLASSES Filed Feb. 28. 1929 4 Sheets-Sheet 2 I i Jjzv/ezaiar.

fave 1W July 18, 1933. P. REUSSER 1,918,668

MACHINE FOR GRINDING THE EDGES OF WATCH GLASSES Filed Feb. 28, 1929 4 Sheets-Sheet 3 July 18, 1933. P, REUSSER 1,918,668

MACHINE FOR GRINDING THE EDGES OF WATCH GLASSES Filed Feb. 28, 1929 4 Sheets-Sheet 4 3161/ E ZUSSCF Patented July 18, 1933 UNITED STATES IPAUL-REUSSER, OF BIEL, SWITZERLAND MACHINE FOR GRINDING THE EDGES OF WATCH GLASSES Application filed February 28, 1929, Serial No.

This invention relates to a machine which permits an automatic working of watch glasses of any desired shape. 1

a An embodiment of the invention is illustrated by way of example in the accompanying drawings in which i Fig. 1 shows a partial section on line IIII of Fig. 2 viewed in the direction of the arrow.

Fig. 2 shows a side elevation of the ma chine.

the work before it is secured in the machine;

Fig. 10 is a side elevation of the machine. i

A guide 2 is rigidly mounted on the frame 1 of the machine in which a slide 3 is mounted in such a manner that the whole machine is shiftable with this slide 3 with the exception of the driving discs 4 and 6 and of th grinding disc 5 on the frame 1.

The pulley 4 is driven from a motor, not shown, and rotates in the same direction as the grinding disc 5 and the groove pulley 6 as they are mounted on the same shaft.

The groovepulley 6 is connected with a groove pulley 7 by an elastic round belt 19. The groove pulley 7 is keyed on a shaft 9 having an endless screw 8 which meshes with a wormv wheel 12' mounted on a shaft 32 (Fig. 2). The engagingof the endless screw 8 with the worm wheel, 12 is effected by rotating the disc 11 to the right into the position shown in full lines in Fig.8. The shaft 9 is horizontally rotatable in a bearing 10, the opposite end of said shaft 9 being supported by the arm 40 so that said shaft can be moved into a horizontal position, and project into the disc 11, rigidly connected Fig. 3 shows in topplan view a feeding- 343,412, and in Switzerland J'anuary15, 1929.

with the arm 40 by a pin 21 engaging in a slot in disc 11. The endless screw 8 can be thus engaged or disengaged from the worm wheel 12 by accordingly turning the disc 11. The disc 11 is held in position by a spiral spring 22. Fig. 8 shows in broken lines the position of disc 11 when the endless screw 8 is out of engagement with the worm-wheel 12 whereby the shaft 9 assumes the position 9' indicated in broken lines. The worm wheel 12 is secured in the wheel by a pin 39 serving to automatically disengage the endless screw 8 by acting on two pins 38 and 46 fixed in a slidable plate 87 adapted to be moved against a pin 47 of disc 11. This operation shown clearly in Fig. 7. V

The worm wheel rotates in the direction of the arrow; the pin 46 is set by the shifting of the slidableplate 37 so that after the first revolution of the worm wheel 12 the pin 39 mounted therein moves the pins, 38 and 46 and therefore the element 37 into the position 38' and 46 indicated in broken lines. On the second revolution; of the worm wheel 12 the pin 39 engages the pin 88 which is now in the position 38 and advances said pin until the disc 11 assumes the position 11 shown in broken lines in Fig. 8, whereby the Worm wheel 12 will no longer be rotated, i. e. the machine is stopped.

Needless to say other combinations may be employed so thatthe machine is only disengaged when the worm wheel 12 has performed more than two revolutions, e. g. by differently arranging a number of pins, dogs or other elements. v

The work 44:, a watch glass, is placed on a rest 13 provided with a suitably soft pad 1e of cork curved according to the grass. In order to accurately position the work on the rest 13, it is set by an angular truein g element 41, as shown in Fig. 9, whereupon by pulling back the handle l3 into the position 43' 42 according to the size ofthe work.

into engagement with the worm wheel-12, the

machine is set inmotion and the edge of the glass is ground.

Figs. 3, 4 and 5show the grinding of square glasses the clutch element 24 with a catch pin and with cam 26, rotating in the same direction as the worm wheel 12, is mounted on the shaft 32'driven by worm wheel-12 and fixed. in the slide 3. A shaft 18 carries a cross-shaped element 23 into. which the rest \Vhen the elementv 13.1 is conically' inserted. 24 has performed arevolution the pin25 engages in the corresponding conical portion of the cross-shaped element 23' causing this latterflto rotatethrough 90 which operation is shown in brokenlines in Fig. 4..

It is apparent that while rotating the glass 44 it must be'brought out of the grinding circle of the grinding disc 5. This is effected by means of a cam 26 which presses against alever 27 oscillatably mounted on a pin 28 and connected with the slide 3. Another lever 29 secured to the guide 2 by means of the screw 30 presses against the lever 27, andserves as support for one end of said lever 27.. The adjustmentv of the lever 29 is effected by means of a set screw 31. Fig. 3 shows the oscillating movement of the slide 3 or of: the

watch glass 44after each revolution of the worm wheel 12, due to the'cam 26 and'to the lever system above described.

' If six, eight-or more-cornered glasses are to be ground, the slide 3 must perform one reciprocating movement for: each edge, this being effected by substitutingforthe crossshaped element 23 a clutch element which is correspondingly divided. The return movement of the slide or of the glass 44 towards the grinding disc?) is effected by the pull action of a spring 20 secured at one end to the machine frame and at the other end to. the slide 3. Instead of the spring 20 a weight might be provided In Fig. 6 a device for grinding oval glasses is shown by way of example. Instead of the cross-shaped element 23 a spur wheel 34 is keyed on the shaft 18 having a part 33 corresponding to the shape of the glass. A spur wheel 35 meshing with wheel 34 is keyed. on the shaft 32 instead of the element 24. The

' element'33 is pressed'against a screw 36, cansing the slide 3 or the glass 44 which is to-be ground to perform a reciprocating movement according to the shape of the element 33. The screw 15 (Fig. 2) serves for adjusting the depth of the grinding path.

It is naturally possible by using suitable combinations to grind glasses with round and straight edges. If circular glasses are to be ground the combination shown in Fig. 6 is employed omitting the oval element 23. For grinding glass the grinding disk is only sprinkled with water.

It is evident that other material may be worked' than glass and that a milling cutter, a plane or other tool can be substituted for the grinding disc 5', when the dividing can be accurately and automatically performed e. g. by gear wheels andother parts.

The machine operates in the following manner:

The piece of glass to be worked or treated. is placed upon the disk 13 with soft support 14 after'the counter-support has been previously raised against the pressure of the spring-17 by lever 16. The glass is adjusted centrically by the trueingmember 41, Figure 9.

The lever 16 is thereupon released and the glass is thereby held between the plates- 14. The glass together with itsholding device 41 is moved against the grinding disk or wheel 5 by the slide 3 adapted to movein the guide 2. The rotation of the glass or Work duringv the grinding of the peripheryis effected by the worm gears 8, 12 continuouslyfor oval shapes according, toFigure 6 and by the Geneva gear according to Figure 4.

for-shapes having several corners. Before each turn, the glass orwork is shifted from the grinding disk or wheel by. the cam 26 in connection with the lever 27 Figure 3', so that during the turningof the glass or work,

the corners thereof are not damaged. The

disengaging device may be adjusted by shifting the disengaging rod 37 so that after 1,

2; or revolutions it disengages the machine by the disk 11.

I claim 1. A machine for grinding and polishing the edges of watch glasses and the like comprisinga' fixed guide, a movable slide mounted thereon, a rest or carrier upon said slide,

means for clamping the work in'said' rest, a

grin'dingdisk, a rotatable vertical shaft supporting said carrier carried by said movableslide, a Geneva gear mounted on said shaft, a pin wheel mounted adjacent said Genevagear upon said slide, a pin carried by. said pin wheel. adapted to engage saideneva gear, a worm wheel carried by the shaft of said pin wheel, a worm mounted upon a movable shaft, said last named shaft belng pivotally mounted at one end, means for moving said worm into and out of engagement with said worm wheel and means for driving said last named shaft.

2. A machine for grinding and polishing tlieedgesofwat'ch glasses and thelike-in accordance with claim lwherein means are provided cooperating with said pin wheel shaft and said movable'slide to move said movable slide carrying a work to and away from said grinding disk.

3. A machine for grinding and polishing the edges of watch glasses and the like in accordance with claim 1 wherein a cam is provided upon said pin wheel shaft cooperating with said movable slide to move said mova- PAUL REUSSER. 

